#!/bin/sh


exit1() {
    echo $@ >&2
    exit 1
}


err() {
    echo $@ >&2
    exit_status=1
}


get_default_gw() {
    echo $(route | grep default | awk '{ print $2 }')
}


test_eth_device() {
    local readonly dev=$1
    local readonly ethernet_ping_ipaddr=$2
    local readonly MINDATASIZE=56
    local readonly MAXDATASIZE=650
    local readonly STEPSIZE=100
    local readonly ITERATION=2
    local datasize
    local i
    local ping_err
    for i in `seq 1 $ITERATION`; do
        datasize=$MINDATASIZE
        while [ $datasize -le $MAXDATASIZE ]; do
            ping -I $dev -c 1 -s $datasize $ethernet_ping_ipaddr > $STATISTICS
            ping_err=$?
            packets_received=`cat $STATISTICS | grep "received" |
                awk '{print$4}'`

            # Evaluate possible errors on the ping operation
            if [ $ping_err -ne 0 ] || [ -z "$packets_received" ] ||
                [ $packets_received -eq 0 ]; then
                err "FAIL: ping $ethernet_ping_ipaddr through $dev"
                cat $STATISTICS >> $LOGFILE
                echo "Size: $datasize Iteration: $i" >> $LOGFILE
            fi
            datasize=$((datasize+STEPSIZE))
        done
    done
}


clean_tasks() {
	echo "Executing clean up tasks"
	rm -f $LOGFILE $STATISTICS
}


cleanup() {
    echo "Aborting script execution"
    clean_tasks
    exit 1
}



readonly LOGFILE=`/bin/mktemp`
readonly STATISTICS=`/bin/mktemp`
exit_status=0

trap cleanup SIGHUP SIGINT SIGTERM



readonly DEF_GW=$(get_default_gw)

[ -n "$DEF_GW" ] && echo "Found default gw $DEF_GW" ||
    exit1 "FAIL: no default gw"

readonly S=:
readonly DEVS="$(route -n | tail -n +3 | sort -k8 -u | awk '{print $8"'$S'"$2}')"

if [ -n "$DEVS" ]; then
    echo "Will test: $DEVS"
else
    exit1 "FAIL: no ethernet devices to test"
fi

for iface_gw in $DEVS; do
    iface=$(echo "$iface_gw" | sed -n 's/\(.*\)'$S'.*/\1/p')
    gw=$(echo "$iface_gw" | sed -n 's/.*'$S'\(.*\)/\1/p')
    if [ -z "$gw" ]; then
        err "FAIL: no ethernet gateway for $iface"
    else
        [ "$gw" = 0.0.0.0 ] && gw="$DEF_GW"
        echo "Testing $iface:$gw"
        test_eth_device $iface $gw
    fi
done

# Report failures
if [ $exit_status -ne 0 ]; then
    echo "=================== error report ==================="
    cat $LOGFILE
    echo "===================================================="
    echo "FAIL: ping test"
else
	echo "PASS: ping test success"
fi

clean_tasks
exit $exit_status